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学科主题: 地理学::自然地理学
题名: ESR dating of glacial moraine deposits: Some insights about the resetting of the germanium (Ge) signal measured in quartz
作者: Yi, CL (Yi, Chaolu)1, 2; Bi, WL (Bi, Weili)1; Li, JP (Li, Jianping)3
通讯作者: Yi, CL
关键词: GRAIN-SIZE DISTRIBUTIONS ; UPPER URUMQI RIVER ; TIAN-SHAN ; QUATERNARY GLACIATION ; TIEN-SHAN ; CHINA ; TILL ; AREA ; MOUNTAINS ; EVOLUTION
刊名: QUATERNARY GEOCHRONOLOGY
发表日期: 2016
DOI: 10.1016/j.quageo.2016.06.003
卷: 35, 期:0, 页:69-76
收录类别: SCI
合作性质: 国内
文章类型: Article
部门归属: 环境
英文摘要: The electron spin resonance (ESR) dating of tills using germanium-doped (Ge) paramagnetic centers in quartz has advantages over other dating techniques, as quartz is common, processing is easy, and the technique has the potential for dating features several hundreds of thousands years old. ESR dating of moraines is based on the supposition that either subglacial comminution or exposure to sunlight resets the signal. However, actual dating suggests that a signal that is initially present cannot be bleached to zero by grinding alone. We found that grinding coarse samples (0.5-1 mm in diameter) to the mean grain size of fine sand (0.125-0.193 mm) reduced the signal intensity to 53-69% of its original value. From the value of the signal difference, one can devise a correction factor for ESR ages of subglacial sediment. Polymineralic grains are commonly present in till. Exposure of them to sunlight for several days can reduce the signal intensity to 7-8% of its original value within 1-2 mm thick of the sediment surface. However, within 5-8 mm of the sediment surface, exposure to sunlight for over one week only reduced the signal intensity to mean plateau values of 42-50% of the initial value. Mixing upper and lower layers of the samples during exposure to sunlight changed the signal intensity. This suggests that the amount of bleaching varies spatially. Sediments initially deposited at the margins of ice caps or ice sheets and subsequently overridden may have been sufficiently exposed to sunlight to allow ESR dating of moraines. The purity of the quartz and the grain size have significant impacts on signal intensity; intensive purification and the use of a uniform fine sand fraction are thus recommended. (C) 2016 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000381325500008
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7599
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Tibetan Environm Changes & Land Surface P, Beijing 100864, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100864, Peoples R China.
3.China Earthquake Adm, Inst Geolo Gy, State Key Lab Earthquake Dynam, Beijing, Peoples R China

Recommended Citation:
Yi, CL ,Bi, WL ,Li, JP . ESR dating of glacial moraine deposits: Some insights about the resetting of the germanium (Ge) signal measured in quartz[J]. QUATERNARY GEOCHRONOLOGY,2016,35(0):69-76.
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